Hello

I am trying to use the Win32 function SystemTimeToTzSpecificLocalTime
to get the time of a local city. And it works but, if the city is
currently using daylight savings then my time comes out 1 hour behind.

I have read in MSDN that i can use this function to take into account
daylight savings IF I alter the TIME_ZONE_INFORMATION struct which is
the 1st argument of the SystemTimeToTzSpecificLocalTime function.

How can I alter a TIME_ZONE_INFORMATION struct to find if daylight
savings will be active in a certain area?

Dealing with all these windows structs & classes is sooo confusing :P
Any suggestions or code how to do it would be really helpful. Maybe
you could alter my code below?

string controller::localTime()
{
    // Post: Returns focus cities local time
    // NOTE AT PRESENT: function doesn't compensate for Daylight
savings. Need 2 change this

    SYSTEMTIME ut, cityTime;
    TIME_ZONE_INFORMATION tz;

    tz.Bias = focusCity->bias;
    tz.StandardBias = 0;
    tz.DaylightBias = -60;
    /*
    unused TIME_ZONE_INFORMATION struct variables
    WCHAR      StandardName[32];
    SYSTEMTIME StandardDate;
    WCHAR      DaylightName[32];
    SYSTEMTIME DaylightDate;
    */

    GetSystemTime(&ut);
    SystemTimeToTzSpecificLocalTime(&tz,&ut,&cityTime);

}

On 25 jan, 04:43, Jimbo <nill...@yahoo.com> wrote:
> Hello
>
> I am trying to use the Win32 function SystemTimeToTzSpecificLocalTime
> to get the time of a local city. And it works but, if the city is
> currently using daylight savings then my time comes out 1 hour behind.
>
> I have read in MSDN that i can use this function to take into account
> daylight savings IF I alter the TIME_ZONE_INFORMATION struct which is
> the 1st argument of the SystemTimeToTzSpecificLocalTime function.
>
> How can I alter a TIME_ZONE_INFORMATION struct to find if daylight
> savings will be active in a certain area?

If you want to get time zones, they are stored in registry (HKLM/
Software/.../Time Zones) (managed by Time Zone Editor  tool (http://
www.dynawell.com/download/reskit/microsoft/win2000/tzedit.zip))
You can call GetTimeZoneInformation() for the current one.